Valve



Allgll, 1931- 4.1. D. LANGDoN 1,818,856. l

VALVE Filed nec.' 15, 1927 Patented ug. 11, 1931 UNITED STATES PATENT OFFICE" JEssR n. LANCnoN, or Los ANGELES, CALIFORNIA, AssIGNoR To LANCDON ENGINEER- l y ING CORPORATION, E Los ANGELES, CALIFORNIA .Y f

VALVE Application filed December 15, 1927. Serial `No. 240,298.

The present invention relates to valves,

and aims to provide a novel and improved self closing or automatic stop valve.

Another object is the provision of a self closing valve having novel means for cushioning or retarding the final closing movement of the valve member, in` order that the valve will close With a soft motion and withA out a jar or shock.

Io A further object of the invention isV the provision of a dash pot arrangement in a valve to cushion or retard the final closing movement of the valve member. Y

.Still another object is the provision of a 16 member Within the valve casing or body which is cooperable With the valve member to cushion the closing movements thereof, and which also serves to prevent leakage along the valve stem or rod, Y v

zo It is also an object of the invention to provide a valve of the character indicated comprising a novel construction and assemblage of the component elements."

lVith the foregoing and other objects in View, Which Will be apparent as the description proceeds, the invention resides in the construction and arrangement of parts, as hereinafter described and claimed, it being understood that changes can be made Within the scope-of What is claimed, Without departing from the spirit of the invention.

The invention is illustrated in the accompanying drawings, Wherein` Figurek 1 is a median section vof the improved valve,the valve stem or rod being shown in elevation, and the valve being closed. y Y Fig. 2 is a similar vieW showing the 'valve'open Y vyThe valve casing or body 7 may beV of any suitable size and shape, and has the inletA 8 .and outlet 9 With a partition 10 between thjem provided With the port or opening v11, aihd the partition 10 has a lip 12 surroundiing said opening and` extending in the din if'ection opposite to the direction of flow.

the direction Aof flow against they lip or annular seat 12, and has the concentric annular flanges 14 and 15 defining an annular A valve member or head 13 is seatable in y groove 16 to lreceive the lipv12. A rubber or other suitable gasket 17 is seated in the i groove 16 to contact With the lip 12 for stopping the flovv of fluid through the port 11. The flanges 14 and 15 are spaced from` the lip 12 on the inner. and outer sides thereof.

lThe valve stem or rod 18 'is slidable throughan outstanding guide 19 with which the casing `7 is provided, and said stemv has a 'handle or knob 20 on` its outer end. The inner terminal of the stem passes ,loosely through a central aperture 21 in the-valve member 13 and has a collar 22 forming a relief valve to seatV against thefvalve member 13 in the direction of flow to close the opening21. Thekstem 18 has lugs 23 Within the valve member 13 to contact with said valve member when the valve stem ispushed into the casing, the space between the collar 22 and lugs 23 being suflicient to permitthe' collar or valve 22 to be unseated from the valve member 13 when tbe lugs 23v contact With said valve member. w Q

A piston and packing vmember 24 of rubber -or similar materialv is mounted Within the easing and has a piston portion 25 projecting into the port 11 tofenter the chamber or recess 28 of the valve `member 13 which is surrounded by the flange 14. This flange isV preferably formed With av bevelled' edge 26, so that the flange Will move over the member 24 Without catching. The member 24 is molded orl otherwise engaged over a flaredportion 27 With which the casing 7 is provided at the innerend of the guide 19, thereby securely fastening the member 24 in place. Said rmember loosely embraces the stem 18 to prevent the fluid from leak-y ing `out along said stem.' y Y n When the valve is closed, asy seen in Fig. 1, `with the'gasket 17 bearing against the lip 12,- the portion 25 of the member 24 extends into the chamber 28, and the collar or relief valve 22 is seated vagainstthe valve member 13 across the opening 21,k By pushing dovvn on tlie stem 18 the vcollar,22"is moved from the valv-elmeinber 13, thereby opening thev chamber 28 through the` opening 21, so as to relieve the pressure in said chamber, and the lugs 23 contacting with the valve member 13 rvvill move it open, thereby permitting the fluid to pass through the port 11 in the direction of the arrows as seen in Fig. 2.

When the stem 18 is released the valve is automatically closed by fluid pressure. The pressure moves the valve stem 18 outwardly, and the valve member 13 is also moved toward its seat. During the flow of fluid through the valve, the chamber 28 is filled With Huid Which remains therein While the valve is closing. The collar or relief valve 22 is seated against the valve member 13 across the opening 21, and before the valve member 13 is seated, the chamber 28 receives the member 24, thereby providing a dashpot arrangement to check or retard the closing movement of the valve with a cushioning action. The fiuid is trapped Within the chamber 28, the member 24; providing a piston Working in the cylinder formed by the flange 14, so that the pressure of the fluid in the chamber 28 is built up to resist the final closing movement of the valve member 15. The pressure forces the fluid out slowly between the flange 14 and member 24, so that the valve member Will seat With a slow gradual movement, and the closing action of the valve is therefore soft and free from jar, noise or shock.

The relief valve 22 is especially desirable with large valve structures, in order to relieve the pressure when opening the valve, and with valves of small size the relief valve may be eliminated, and the valve member 13 secured tightly to the valve stem.

Having thus described the invention, What is claimed as new is l. A valve comprising a casing, a stem slidable therein, a valve member movable with the stem and having a chamber and a surrounding annular groove, a gasket in said groove, the casinghaving an annular valve seat to enter said groove for the contact of said gasket, and a packing and piston member of rubber or similar material mounted in the casing and having a portion to snugly enter said chamber during the closing movement of the valve member for retarding such closing movement.

2,. A valve comprising a casing, a stem slidable therein, a valve member movable with the stem and having a chamber and a surrounding annular groove, the casing having an Vannular valve seat adapted to seat in said groove for closing the valve and a packing and piston member mounted in the casing and having a portion to snugly enter said chamber during the closing movement of the valve member for retarding such closing movement.

, In testimony whereof I hereunto aflix my signature.

JESSE D. LNGDON.` 

